Language is the most common barrier to communicating abroad, and can be a real headache for travellers. You might try to get by with simple words or phrases you've picked up from books, or sometimes you'll resort to using Google translate to facilitate a conversation.
In the past, we've seen a smattering of palm-held electronic translators like this that never really took off, and apps that offer speech-to-text translations but require network connection (something that's not always available abroad).
Now there's Pilot – an in-ear device, that wirelessly connects with a smartphone app, translating both sides of your conversations in real-time. Or at least there's an Indiegogo campaign for the development of the technology.